What is the mass number of an atom that has 4 protons, 4 electrons and 5 neutrons?
回答 (1)
2020-09-02 1:14 am
Mass number
= (No. of protons) + (No. of neutrons)
= 4 + 5
= 9
= (No. of protons) + (No. of neutrons)
= 4 + 5
= 9
收錄日期: 2021-04-24 08:24:37
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